*{
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

em,
i{
  font-style: normal;
}

li{
  list-style: none;
}

img{
  border: 0;
  // 取消图片底部有空白间隙的问题
  vertical-align: middle;
}

button{
  border: none;
  background: none;
  cursor: pointer;
}

